Turns out, the entire bunch of celery is actually the celery stalk, and a single stick from that stalk is called a rib.
How many celery are in a bunch?
After surveying the vegetable selection we discovered that 1 bunch of celery typically contains 8 or 9 medium ribbed stalks and weighs about 1 pound.
What is an individual piece of celery called?
According to the USDA, a “stalk” means the whole bunch or head and a single piece or stick is called a “rib.” This does not reflect common usage, however, so use caution in interpreting recipes! “Celery stalk,” in American English, is commonly used to mean one piece/rib/stick of celery.
Supermarket celery is often sold in bundles of celery “hearts,” sans leaves. And, if your local grocer doesn’t carry celery with the leaves attached, ask them to! After all, you deserve to get the whole vegetable, leaves and all.